Juniper MX10008, Руководство по оборудованию

Страница: 96 / 361

Table 30: Rack Requirements for the MX10008
Guidelines Rack Requirement
Use a four-post rack that provides bracket holes or hole patterns spaced
at 1 U (1.75 in. or 4.45 cm) increments and that meets the size and
strength requirements to support the weight.
A U is the standard rack unit defined in Cabinets, Racks, Panels, and
Associated Equipment (document number EIA-310–D) published by the
Electronics Industry Association.
You can stack three MX10008 routers if:
•
The rack is 39 U or greater.
•
The rack meets the strength requirements to support the weight.
•
The facility can provide adequate power and cooling.
Rack type: four-post
The holes in the rack mount kit are spaced at 1 U (1.75 in. or 4.45 cm),
so that the router can be mounted in any rack that provides holes spaced
at that distance.
Rack mount kit hole spacing
•
Ensure that the rack complies with the standards for a 19-in. wide
rack as defined in Cabinets, Racks, Panels, and Associated Equipment
(document number EIA-310–D) published by the Electronics Industry
Association.
•
Use one of the standard rack lengths as defined in the four-part
Equipment Engineering (EE); European telecommunications standard for
equipment practice (document numbers ETS 300 119-1 through 119-4)
published by the European Telecommunications Standards Institute
( http://www.etsi.org ).
•
23.62 in. (600 mm)
•
30.0 in. (762 mm)
•
31.5 in. (800 mm)
•
Ensure that the rack rails are spaced widely enough to accommodate
the router chassis’ external dimensions. The outer edges of the flange
extend the chassis width to 19 in. (48.26 cm).
•
Ensure that the rack is strong enough to support the weight of the
router and cabling.
•
Ensure that the spacing of rails and adjacent racks allows for proper
clearance around the router and rack. See “MX10008 Clearance
Requirements for Airflow and Hardware Maintenance” on page 98 .
Rack size and strength
97